Greece's banking stocks have rebounded after a three-day rout that wiped 63% from their market value.
The banking index was 17.8% higher with all of its constituent stocks closing with gains.
They were led by a 27.4% jump in National Bank, Greece's largest lender.
The banking index had dropped 3.6% early in the session. Alpha Bank reversed a 26% early loss to close 11.6% higher.
"There was a lot of selling steam let out in the previous sessions, we may be in for some more upside tomorrow but trading will stay choppy. We saw a technical reaction to oversold levels today," said investment adviser Theodore Mouratidis.
The broader market - of which banking stocks make up around 20% - ended up 3.6%. Only three of the 25 stocks in the blue-chip index closed with losses, including engineering contractor Metka and jewellery retailer Folli Follie.
Telecoms provider OTE closed 9.3% higher despite posting a second-quarter loss due to a voluntary redundancy scheme and a weak performance by its foreign operations.
Greece's banks need to be recapitalised after a flight of euros from deposits for most of this year and mounting bad loans. But that will hurt existing shareholders, when it comes, by diluting the value of their holdings.
Athens and its international lenders share the view that banks must complete their recapitalisation by the end of this year and avoid a haircut on large depositors, Greece's finance minister said on Wednesday.
The European Union estimates the recapitalisation may cost between €10 billion and €25 billion.
"The key determinant for bank values remains the outcome of the coming comprehensive assessment by regulators," said analyst Nick Koskoletos at Athens-based Eurobank Equities.